Has anyone tried to replace the html markup of three select drop downs by looping through an array?

// Categories array
$categories = [];

$categories["Books"] = [
    "Format" => [
        "Audio",
        "Ebook",
        "Hardback",
        "Paperback",
    ],

    "Genre" => [
        "Action",
        "Adventure",
        "Comedy",
        "Fantasy",
        "Historical",
        "Historical Fiction",
        "Horror",
        "Magical Realism",
        "Mystery",
        "Paranoid",
        "Philosophical",
        "Political",
        "Romance",
        "Saga",
        "Satire",
        "Sci-Fi",
        "Tech",
        "Thriller",
        "Urban",
    ],
];

$categories["Movies"] = [
    "Format" => [
        "Blu-ray",
        "DVD",
        "Streaming",
        "VHS",
    ],

    "Genre" => [
        "Action",
        "Adventure",
        "Animation",
        "Biography",
        "Comedy",
        "Crime",
        "Documentary",
        "Drama",
        "Family",
        "Fantasy",
        "Film-Noir",
        "History",
        "Horror",
        "Musical",
        "Mystery",
        "Romance",
        "Sci-Fi",
        "Sport",
        "Thriller",
        "War",
        "Western",
    ],
];

$categories["Music"] = [
     "Format" => [
        "Cassette",
        "CD",
        "MP3",
        "Vinyl",
    ],

    "Genre" => [
        "Alternative",
        "Blues",
        "Classical",
        "Country",
        "Dance",
        "Easy Listening",
        "Electronic",
        "Folk",
        "Hip Hop/Rap",
        "Inspirational/Gospel",
        "Jazz",
        "Latin",
        "New Age",
        "Opera",
        "Pop",
        "R&B/Soul",
        "Reggae",
        "Rock",
    ],
];



<form method="post" action="test_suggest.php">
    <table>
      <tr>
         <th><label for="name">Name (required)</label></th>
         <td><input type="text" id="name" name="name" value="<?php if (isset($name)) echo $name; ?>"/></td>
      </tr>

      <tr>
         <th><label for="email">Email (required)</label></th>
         <td><input type="text" id="email" name="email" value="<?php if (isset($email)) echo $email; ?>" /></td>
      </tr>

      <tr>
         <th><label for="category">Category (required)</label></th>
         <td>
           <select id="category" name="category">
             <option value="">Select One</option>
              <?php 
              foreach($categories as $key => $val) { ?>
                <option value="<?php echo $key; ?>" <?php if (isset($category) && $category == "$key") echo " selected"; ?>><?php echo $key; ?></option>
                <?php 
              } ?>
           </select>
         </td>
      </tr>

      <tr>
         <th><label for="title">Title (required)</label></th>
         <td><input type="text" id="title" name="title" value="<?php if (isset($title)) echo $title; ?>"/></td>
      </tr>

      <tr>
         <th><label for="format">Format</label></th>
         <td>
           <select id="format" name="format">
             <option value="">Select One</option>
             <?php 
             foreach($categories as $key => $val) { ?>
                 <optgroup label="<?php echo $key; ?>"><?php 
                     foreach($val as $type_key => $tval) {
                         if($type_key == "Format") {
                             foreach($tval as $item_key => $item) { ?>
                                 <option value="<?php echo $item; ?>" 
                                      <?php if (isset($format) && $format == "$item") echo " selected"; ?>>
                                      <?php echo $item; ?>
                                 </option><?php 
                             }
                         }
                     } ?>
                 </optgroup><?php 
             } ?>
           </select>
         </td>
      </tr>

      <tr>
            <th>
                <label for="genre">Genre</label>
            </th>
            <td>
                <select name="genre" id="genre">
                    <option value="">Select One</option>
                    <?php 
     foreach($categories as $key => $val) { ?>
       <optgroup label="<?php echo $key; ?>">
         <?php 
         foreach($val as $type_key => $tval) {
            if($type_key == "Genre") { ?>
               <?php 
               foreach($tval as $item_key => $item) { ?>
                  <option value="<?php echo $item; ?>" 
                      <?php 
                       if (isset($format) && $format == "$item") echo " selected"; ?>>
                      <?php echo $item; ?>
                  </option><?php 
               }
            }
         } ?>
      </optgroup><?php 
     } ?>
                </select>
            </td>
        </tr>

      <tr>
         <th><label for="year">Year</label></th>
         <td><input type="text" id="year" name="year" value="<?php 
                       if (isset($year)) echo $year; ?>"/>
         </td>
      </tr>

      <tr>
         <th><label for="details">Additional Details</label></th>
         <td>
                 <textarea name="details" id="details"><?php 
                        if (isset($details)) echo $details; ?>
                 </textarea>
          </td>
      </tr>

      <tr style="display:none;">
         <th><label for="address">Address</label></th>
         <td><input type="text" name="address" id="address" /></td>
        <p>Please leave this field blank</p>
      </tr>


    </table>

    <input type="submit" value="Send" />

  </form>